Another very bad variation of ur mom that is generally used when speaking about incest but can also be used in many other situations.
Warning: using this variation of the common phrase "ur mom" may cause confusion due to it's unpopularity.
John: hey bro, what's up?
Dick: ur cousin
John: what?
1- Child of parent’s full sister and of other parent’s full brother at the same time.
2- Child of paternal aunt (father's sister) and of maternal uncle (mother's brother) at the same time.
3- Child of maternal aunt (mother's sister) and of paternal uncle (father's brother) at the same time.
4- Nibling (biological) of mother and of father at the same time.
5- Two parents's nibling.
6- Person who, in relation to the other person, has zero parents and four grandparents in common.
7- Double-cousin.
8- Double-1C.
My double-first-cousin is a good person.
1- Child of uncle (father's brother) and of aunt (mother's sister) at the same time.
2- Child of uncle (mother's brother) and of aunt (father's sister) at the same time.
3- Someone who, in relation to others, has zero parents and four grandparents in common.
Double-cousin or double-1C:
1- Child of their parent’s full sibling with the other parent’s full sibling.
2- Person who, in relation to the other person, has zero parents and four grandparents in common.
My double-first-cousin is a good person.
Child of a person's maternal aunt (mother’s sister) with that same person's paternal uncle (father’s brother) or child of a person's paternal aunt (father’s sister) with that same person's maternal uncle (mother’s brother).
My double-first cousin is a good person.
4.5-tuple-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and nine great-great-grandparents in common.
My 4.5-tuple-third-cousin is a good person.
1- Third-cousin-once-removed's spouse.
2- Spouse's third-cousin-once-removed.
My third-cousin-once-removed-in-law is a good person.